Improvement



this time.

WILLIAM D. ALFORD, OF OUYAHOGA FALLS, OHIO.

IMPROVEMENT EN MOLDlNG PIPES.

Specification forming part of Letters Patent No. 119,259, dated September 26, 1871.

To all whom it may concern.'

Bc it known that l, WILLIAM D. ALFoRD, of Cuyahoga Falls, in the county of Summit and State of Ohio, have invented a certain new and Improved Method of Molding Pipe, of which the following is a description, reference being had to the accompanying drawing making part of this specification.

Figure 1 is a side view of the pipe-pattern. Fig. 2 is an end view. Fig. 3 is a detached section.

Like letters of reference refer to like' parts in the diiferent views.

The nature of this invention relates to a pattern for molding pipe; and the object of which is to cast the screw on the end of the pipe in a more true and perfect manner than can be done in the ordinary way, so that said screws shall require no subsequent inishin g to fit them for use. Said pattern is made to consist of a solid shaft for the section of pipe, and the screw part of the pattern is attached to it in sections, as hereinafter more fully described.

In the drawing, Fig. l, A represents the pattern for the body or length of pipe, which may be of any desirable length and capacity. The extreme ends B form the core-print inwhich to rest the core for making the bore of the pipe, as in the usual way.- Said pattern or the partA is of one piece-that is to say, it is not cut longitudinally through the center, making two halfsections, as pipe-patterns usually are. G C represent the screwpart of the pattern, and which consists of equal sections,'each section being onehalf transversely of the screw, as shown in Fig.

2. Said sections are n ot attached to the tubular part A of the pattern in a permanent manner, but are simply laid thereon and temporarily retained by dowel-pins, which admit of the sections being readily taken off or placed therein in the process of molding, which process is as follows: The pattern is let into the follow-board, especially made for that purpose, in the position shown in Fig. 1. The section G of the nut is left off at The board indicated by the dotted line is so constructed as to receive one-half of the pattern; hence, but one-half of the diameter of the pattern only will be in the liask above the board, whereas the other or lower half will be in the follow-board. One section of the screw is then put on, which would be the part G. The

sand is then thrown in and rammed down in the ordinary manner. This being done, the flask is then. turned over and the follow-board removed, thereby bringing the pattern half buried inthe sand at the top, with its opposite half above the sand exposed, which, on being dressed in the ordinary way, the section O of the screw is then laid on the pattern so as to fit correspondingly the other section in the sand. In the section C is a threaded hole, a, in which is screwed a rod or anchor, the upper end of which projects above the cope or upper part or the flask, which at this time is put on and to which said rod is made fast; 0r it may be allowed to remain without being attached to the iiask until the sand is filled into the cope, tamped down, and madeready for lifting oft'. The rod, if need be, can then be secured to the face of the sand or to the cope, or in any way to prevent it from being drawn through the sand on lifting oft' the cope. It will be obvious that, on lifting off the cope, section C ofthe screw will be lifted therewith, leaving the pattern A and section C of the screw in the sand. The pattern A is now drawn, leaving the screw-section C behind in the sand, it not being attached to the pattern, but, merely laid thereon, and will there fore not draw from the sand with the pattern A.

VThe pattern, or part A of the pattern, being lifted out, the section C of the screw is drawn, and so, also, the section C in the cope, therod holding the screw-section iirst being loosened to admit of its coming out. The several parts of the pattern now being drawn from the sand, the core for the pipe is laid in the print and the cope replaced upon the iiask in the usual manner.

The ordinary way of making this classof pipe is by using a pattern divided longitudinally into two equal parts or halves, and which are litted to each other by dowel-pins. To each section of the screw, which, with its respective pipe-part of the pattern, forms one piece or half ofthe entire pattern, one-half of the pattern is then molded in the iiask, which, when the iiask is turnedover, the other half is placed upon that in the sand, and the last half molded in the cope .in the same way as is ordinarily done with a two-part pattern. The objection to this way of molding pipehaving a screwon one or both ends is that, in consequence of the great length and weight of the pattern, it is very difficult to draw it from the sand without doing more or less injury to the screw, thel peculiar shape ofwhieh andthe closeness of the threads causing said threadsto break down orbeeomedis placed, and therefore irregular, so that they Will not screw into the nut or a corresponding section of pipe Without rst being finished by hand, in order that they may Work freely and easily in the female thread. This objection is avoided by my Way of making the pattern and moldin g the same, for, on drawing the pipe-section of the pattern from the sand the screw or sections thereof are left undisturbed in the sand, so that, in the event the part A of the pattern should be lifted faster at one end than at the other, or in an unsteady manner, it will not disturb the screw part of the pattern, as it is not attached to it, but \vl1iel1,be ing of sm all size, can be drawn from the sand in the inost earetul manner, Without doing injury to the thread, but which Will remain firm and smooth, and therefore 1n alte a true and perfect east of the thread. Another objection to a two-part pattern is that the sections are liable to spring in e011- sequenee of their length, and thereby make a crooked pipe or mold, which, however, is obviated by having the pipe part of the pattern of one entire piece, thereby securing for it' double the resistance to all influences that might tend to spring or Warp it. The pattern is also much more easily made than the two-part one, and when made is stronger, more durable, and eertain in the results of its use.

What I claim as my improvement, andl desire to secure by Letters Patent, s-

The herein-described pipe-pattern, consisting of the single or one part A, and screw part consisting of the detached sections Q C',Wl1en used in connection with the part A, in the manner substantially as set forth, and for the purpose specilied.

WILLIAM D. ALFORD. Witnesses:

J. H. BURRmGE, D. L. HUMPHREY. 

